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The <a href="https://www.tug.org/applications/pdftex/NEWS"
moz-do-not-send="true">ChangeLog of pdftex</a>, when enumerating
the changes in <code style="font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; font-weight: 550; background-color: rgba(119, 119, 119, 0.3); border-radius: 3px; display: inline;">pdfTeX 3.14159265-2.6-1.40.17 (TeX Live 2016) (May 20, 2016)</code>,
says:
<div class="moz-forward-container">
<div class="markdown-here-wrapper" data-md-url="" style="">
<blockquote style="margin: 1.2em 0px;border-left: 4px solid
rgb(51, 117, 221); padding: 0px 1em; color: rgb(119, 119,
119); quotes: none;">
<p style="margin: 0px 0px 1.2em !important;"> new primitive
\pdfsuppressptexinfo to omit PTEX.* keys from output;</p>
<p style="margin: 0px 0px 1.2em !important;"> the value is a
bitmask:</p>
<p style="margin: 0px 0px 1.2em !important;"> % 1 ->
PTEX.Fullbanner</p>
<p style="margin: 0px 0px 1.2em !important;"> % 2 ->
PTEX.FileName</p>
<p style="margin: 0px 0px 1.2em !important;"> % 4 ->
PTEX.PageNumber</p>
<p style="margin: 0px 0px 1.2em !important;"> % 8 ->
PTEX.InfoDict (/Producer /Creator /CreationDate /ModDate
/Trapped)</p>
</blockquote>
<p style="margin: 0px 0px 1.2em !important;">I wrote the
following code:</p>
<pre style="font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; font-weight: 550; background-color: rgba(119, 119, 119, 0.3); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\author{Joe Six Pack}
\title{Lecture 1}
\pdfsuppressptexinfo15
\begin{document}
Hello world!
\end{document}
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">I have this pdftex:</p>
<pre style="font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; font-weight: 550; background-color: rgba(119, 119, 119, 0.3); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">$ pdftex --version
pdfTeX 3.141592653-2.6-1.40.22 (TeX Live 2021)
kpathsea version 6.3.3
Copyright 2021 Han The Thanh (pdfTeX) et al.
There is NO warranty. Redistribution of this software is
covered by the terms of both the pdfTeX copyright and
the Lesser GNU General Public License.
For more information about these matters, see the file
named COPYING and the pdfTeX source.
Primary author of pdfTeX: Han The Thanh (pdfTeX) et al.
Compiled with libpng 1.6.37; using libpng 1.6.37
Compiled with zlib 1.2.11; using zlib 1.2.11
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">I compiled my code,
and then i called exiftools on the result. Here is the output:</p>
<pre style="font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; font-weight: 550; background-color: rgba(119, 119, 119, 0.3); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">$ exiftool -All -a test.pdf
ExifTool Version Number : 12.30
File Name : test.pdf
Directory : .
File Size : 21 KiB
File Modification Date/Time : 2022:01:30 05:49:44+01:00
File Access Date/Time : 2022:01:30 05:49:44+01:00
File Inode Change Date/Time : 2022:01:30 05:49:44+01:00
File Permissions : -rw-r--r--
File Type : PDF
File Type Extension : pdf
MIME Type : application/pdf
PDF Version : 1.5
Linearized : No
Page Count : 1
Producer : pdfTeX-1.40.22
Creator : TeX
Create Date : 2022:01:30 05:49:44+01:00
Modify Date : 2022:01:30 05:49:44+01:00
Trapped : False
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">We have the
producer, the creator, the modified date, the creation date
and also trapped.</p>
<p style="margin: 0px 0px 1.2em !important;">My understanding is
that the number 15 (=1+2+4+8) would set all the bits.</p>
<p style="margin: 0px 0px 1.2em !important;">Am I doing
something wrong?</p>
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aria-hidden="true"
style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0;padding:0;margin:0;"></div>
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